CN102842241A - Collection and transition method of real-time traffic information of limited region in front of car - Google Patents
Collection and transition method of real-time traffic information of limited region in front of car Download PDFInfo
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- CN102842241A CN102842241A CN2012103233521A CN201210323352A CN102842241A CN 102842241 A CN102842241 A CN 102842241A CN 2012103233521 A CN2012103233521 A CN 2012103233521A CN 201210323352 A CN201210323352 A CN 201210323352A CN 102842241 A CN102842241 A CN 102842241A
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- G—PHYSICS
- G08—SIGNALLING
- G08G—TRAFFIC CONTROL SYSTEMS
- G08G1/00—Traffic control systems for road vehicles
- G08G1/09—Arrangements for giving variable traffic instructions
- G08G1/0962—Arrangements for giving variable traffic instructions having an indicator mounted inside the vehicle, e.g. giving voice messages
- G08G1/0967—Systems involving transmission of highway information, e.g. weather, speed limits
- G08G1/096766—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission
- G08G1/096791—Systems involving transmission of highway information, e.g. weather, speed limits where the system is characterised by the origin of the information transmission where the origin of the information is another vehicle
Abstract
The invention provides a collection and transition method of real-time traffic information of a limited region in front of a car. Based on a vehicle-mounted satellite navigation system, the method disclosed by the invention is formed by a wireless communication system, a road and communication manner planning system, a real-time traffic information collection and treatment system, a database system and a real-time traffic information transmission system. The method comprises the following steps of: taking a wireless broadcasting communication manner to carry out information transmission to divide a road into regions and distribute communication resources; mutually exchanging information of vehicles in each region and determining speed information and a region and an information transmission person; backwards relaying and transmitting the real-time traffic information of the limited region in front of the car by the information transmission person according to a size of weight; and automatically obtaining the front real-time traffic information by the car at the back side. The vehicle utilizes the characteristic that an urban net density is great to avoid low-speed and congestion road sections in time, so that bearing capability of a city road is improved and a city road congestion problem is solved.
Description
Technical field
The present invention relates to the information switching method of no control center between collection, coding, road subregion and communication planning, the vehicle based on the car speed on the satellite navigation car-mounted terminal, position, temporal information and the automated wireless broadcast type relay transmission techniques of Real-time Traffic Information.
Background technology
The automobile civilization is the irresistible direction of human social development, and having a good transport and communication network is the eternal target that people pursue.The scientific-technical progress in fields such as satellite navigation, intelligent transportation system and modern communications is laid a good foundation for people realize the target that has a good transport and communication network.
To the driver, driving safety is a cardinal task, has the technological development direction of the networking of cut-offfing that the driver is had weak point at present, and it has disperseed driver's notice, forms potential safety hazard.Automatically, intelligence turns to the driver provides transport information to be only developing direction.
The ageing requirement of Real-time Traffic Information is high, contains much information, and it is that first the concentrating afterwards of information distributed that prior art provides the general character of the method for Real-time Traffic Information, and its weak point is big to the radio frequency resources occupancy, and economy is low, and it is high to implement difficulty.
In very long one period after current the reaching, traffic jam issue mainly occurs in the city.The characteristics that urban road has that density is big, the intersection is many, vehicle if can in time obtain the Real-time Traffic Information in limited area highway section, the place ahead, avoids low speed and the highway section that blocks up, can greatly improve urban road load-bearing capacity and people go out line efficiency.
Summary of the invention
For overcoming the deficiency of above-mentioned prior art, the present invention provides a kind of automobile on the satellite navigation car-mounted terminal, to use the wireless broadcast communication mode to obtain the method for the place ahead limited area road Real-time Traffic Information automatically.Its effect is to make vehicle in time obtain the Real-time Traffic Information in limited area highway section, the place ahead, utilizes the big characteristics of city road network density, effectively evades the low speed and the highway section that blocks up, and greatly improves the load-bearing capacity of urban road, solves the urban road congestion problem.The present invention is based on vehicle-mounted satellite navigation system, form (referring to Fig. 1) by wireless communication system, road and communication mode planning system, Real-time Traffic Information acquisition processing system, Database Systems and Real-time Traffic Information transmission system.
Wireless communication system
Use 802.11 standards as the wireless communication system basis, with radio broadcasting mode using system hardware.With 2412MHz, 2432MHz, 2452MHz, four frequencies of 2472MHz (representing with h, i, j, k respectively) in the public radio band of 2.4G; With the Time Division Multiplexing method (represent the different periods with 1,2,3,4 respectively, each the time segment length be 10 milliseconds) obtain 16 virtual frequencies (frequency is encoded to: h1, i1, j1, k1, h2, i2, j2, k2, h3, i3, j3, k3, h4, i4, j4, k4).With the concurrent carry information of full detail of all logic frequencies of 802.11 chips reception, this chip is used for access of radio network.
Road and communication mode planning system
With the satellite navigation map is foundation; The frequent parking sites of vehicle such as (usual friendship, grade separation, rotating disk, hand over) road, T-shaped road, charge station, inspection post that will intersect are confirmed as node more; Has been to press east, south, west, 4 working direction in north with road with node, each direction is cut apart with 4 districts (each district fundamental length be 100 meters) circulation, and remainder is less than 50 meters; Incorporate last district into, remainder is done a district in addition more than or equal to 50 meters persons.With A, B, C, D to the subregion mark that circulates successively; Westwards, footnote is done with 1,2,3,4 respectively to vehicle in south, east, the north; Generate westwards A1, B1, C1, D1; Northwards A2, B2, C2, D2, A3, B3, C3, D3 eastwards, A4 to the south, B4, C4, D4 amount to 16 different districts of 16 different coding representatives.Be that 16 districts distribute 16 radio communication frequencies, give equidirectional district the frequency point allocation of identical period.Road subregion and the corresponding relation of the frequency of communicating by letter (referring to Fig. 2) as shown in table 1:
Table 1 (the road subregion and the frequency mapping table of communicating by letter)
| Zonal coding | A1 | B1 | C1 | D1 | A2 | B2 | C2 | D2 | A3 | B3 | C3 | D3 | A4 | B4 | C4 | D4 |
| The frequency coding | h1 | i1 | j1 | k1 | h2 | i2 | j2 | k2 | h3 | i3 | j3 | k3 | h4 | i4 | j4 | k4 |
If total district number is that 4 multiple adds at 1 o'clock between two nodes, judge the size in last district: during more than or equal to 100 meters, break it into two; Otherwise it is merged with two districts, back, break it into two again.It is not district's number of (4N+1) that highway section between two nodes is divided into, to exempt Communication Jamming.
For non-positive thing, north and south road, be foundation with the road working direction at node place, near principle, direction is confirmed as thing or North and South direction with, to next node reorientation again.
When distance is less than 150 meters between two nodes, less node is ignored.Node size is a foundation with the road traffic busy extent, if can not distinguish size, assert that then node to the west and by north is for big.
Complicated highway sections such as rotating disk crossing, multiple-input, multiple-output crossing are converted into the crossroad carry out subregion, be the main preferential subregion of traffic route (allocate communications frequency).Non-main traffic route has the district of Communication Jamming (interference distance is decided to be 200 meters in straight line) all to be labeled as A5 to main traffic route, is its subregion not influencing under the main traffic route signal intelligence according to above-mentioned zoning ordinance.For equidirectional multilayer, parallel (vertical range is less than 200 meters) road, main traffic route to be confirmed as in the busiest highway section carried out subregion, other has the district of Communication Jamming to be labeled as A5 to main traffic route.The A5 district is the allocate communications frequency not, receives only wireless signal (referring to Fig. 3).
Use above rule,, obtain road and wireless frequency planning database (hereinafter is referred to as planning database) and supply native system to use the disposable planning of navigation map.
The Real-time Traffic Information acquisition processing system
Obtain a velocity amplitude from the satellite navigation system per second, 5 speed additions are removed 5 obtain mean value, and with its speed as the vehicle location.Velocity information is reduced to 0,1,2,5,10,15,20,30,50,75 and 90 (km/hour) above 11 grades: be decided to be 0 below 0.1; Be decided to be 1 greater than 0 smaller or equal to 1.5; Be decided to be 2 greater than 1.5 smaller or equal to 2.5; Be decided to be 5 greater than 2.5 smaller or equal to 7.5; Be decided to be 10 greater than 7.5 smaller or equal to 12.5; Be decided to be 15 greater than 12.5 smaller or equal to 17.5; Be decided to be 20 greater than 17.5 smaller or equal to 22.5; Be decided to be 30 greater than 22.5 smaller or equal to 37.5; Be decided to be 50 greater than 37.5 smaller or equal to 62.5; Be decided to be 75 greater than 62.5 smaller or equal to 87.5; Be decided to be more than 90 greater than 87.5.The effect of above-mentioned velocity stages method is the stability of the value of building up speed, and the duration information and the minimizing that have the speed of actual use value with generation need information transmitted amount (hereinafter is with the speed class of speed representation vehicle location).
Database Systems
Limited area definition (referring to Fig. 4): with vehicle front, about the road that comprised in each R km radius as limited area (the R initial value is 2, and minimum value is 1).Change according to quantity of information size and transmittability, the big I of limited area is adjusted automatically, and its rule is: if time information transmission period is more than needed, excess time, then the R value increased a step-length unit greater than 10 of time used; Excess time, then the R value reduced by a step-length unit less than the per mille of time used; R value step-length unit is 100 meters.
Set up planning database, historical data base, information of vehicles switching database and real-time data base, real-time data base is the basis with the limited area, and institute's inclusion region size changes with road network density and communication capacity.
Planning database:, supply native system to use by road and the disposable generation of communication mode planning system.
Historical data base: was to average storage again the time period with 30 minutes former all speed datas that obtain with 5 minutes, and the time is as the criterion with final time, and every group of information is made up of position, 2 data of speed.
The information that dialog database: storage of cars T1 (dialogue) period self generates, the information that other vehicle of local area sends and information of vehicles exchange control variable.
Real-time data base: comprising top database (memory limited zone (R+2) interior speed be 0 and the duration greater than 5 minutes Real-time Traffic Information, every group of information is made up of position, duration 2 data); The one-level database (memory limited zone (R+1) interior speed be 1 and the duration greater than 2 minutes Real-time Traffic Information, every group of information is made up of position, duration 2 data); External information database (memory limited zone (R) interior traffic lights, traffic temporary control, promptly dodge information, the serious congestion information of urban road); Limited area database (up-to-date transport information is respectively distinguished in the memory limited zone, and every group of information is made up of position, speed, duration 3 data).
The Real-time Traffic Information transmission system
Native system divides T1 (dialogue), T2 (transmission), three period circular flows of T3 (concerning foreign affairs), and respectively 1.5 seconds times spent, 3 seconds and 0.5 second, three periods amount to 5 seconds times spent.
Set up T1 period information of vehicles exchange control variable: K; Ki; Gi; Ji; Vi; Qi; Si; G; J; V; Kj; C; N; D; Tx; Ti.
Variable K is a vehicle dialog procedure random number maximal value; Variable Ki{Ki=1,2,3 ... (K-2), (K-1), K} is the random number of vehicle dialog procedure; Variable Kj is the random number of other vehicle of receiving; Variable V is that information is sent successful number of times in the registration of vehicle dialog procedure; Variable V i is for writing down the numbering of the success of posting a letter in the vehicle dialog procedure of posting a letter; Variable J is the number of times that information is sent in the registration of vehicle dialog procedure; Variable Ji is the numbering of posting a letter of the vehicle of posting a letter in the record dialog procedure; Variable C is the number of times of information collision in the registration of vehicle dialog procedure; Variable Si is the sign that whether self information is correctly obtained by other vehicle in the registration of vehicle dialogue period (0 for not, 1 for being); Variable G is that registration of vehicle is talked with the final successful number of times of information in the period; Variable Gi is that registration of vehicle is talked with the final successful numbering of information in the period; Whether variables D has only a car in distinguishing in order to judgement; Variable N is in order to record dialog procedure number of times; Variable Tx is a T1 period timer; Variable Ti is each dialog procedure timer; Variable Qi is information of vehicles weight coefficient (its concrete numerical value equals top database and the one-level database data is counted sum); Variable M2 is a vehicle dialog procedure originator success or not information (Vi representes that greater than 0 the Ji originator posts a letter successfully); Variable M1 is vehicle dialog information (comprising Ki, speed, position, Qi, M2).
T1 period operation rule (referring to Fig. 5):
Vehicle is at first according to geographical location information, with self being included into certain district, confirms the communication frequency that self should use according to road and communication mode layout data library information again.Vehicle initialization dialog database (makes K=30 in the message exchange control variable, N=D=G=V=J=C=Kj=Gi=Si=Ti=Tx=0).The Tx timing begins.Successfully do not send the information vehicle and generate 1 to K random number Ki (A point).The Ti timing begins.The vehicle that is numbered Ki is intercepted in the district and is not posted a letter if there is other vehicle; Then constantly begin, send information M1 at random constantly and make Ji=J=J+1 in the self information exchange control variable 0 to 8 from (10 (Ki-Kj-C-1)+1) microsecond (hereinafter chronomere do not have when clearly marking all be unit) with delicate.Ki number identical does not get sender meeting person and judges that self numbering Ki+5 is whether less than K: if, again (Ki+1) between the K immediately numbering participate in this process; Otherwise participate in process (hereinafter with variable representative information exchange control variable) next time.
Vehicle receives information, if the information success then makes Gi=G=G+1, Ji=J=J+1, Vi=V=V+1, Kj=Ki, C=0 in its variable; Vi in the M2 information greater than 0, is made Si=1 in its variable; Otherwise, make Ji=J=J+1, C=C+1, Gi=Vi=Ki=0 in its variable.
The vehicle that completion is posted a letter and moved self is posted a letter success not according to the information judgement that follow-up vehicle sends: if successful, then make Gi=G=G+1 in the own variable, Vi=V=V+1, Si=1; Otherwise, make Gi=Vi=Ki+0 in the own variable.
Vehicle equals 0 then the end dialog period if judge J after signal-less time is greater than (10 (K-Kj-C)+1); Otherwise, judge that (P1) sends information M2 if N and G, then are numbered the vehicle of G1 all greater than 0.Vehicle according to M2 information to Vi greater than 0, make Si=1 in its variable.Accomplish the vehicle of the action of posting a letter at last and judge that according to M2 information (P2) self posts a letter success not: if success makes Gi=G=G+1 in the own variable, Vi=V=V+1, Kj=Ki, Si=1.All vehicles make Ki=Gi=Vi=0 in the variable of Si=0.Judge that whether G is greater than 10: if, the end dialog period; Otherwise, for adding 1, the N counter judges that more whether N is greater than 2: if, the end dialog period; Otherwise, judge that Ti is whether greater than T1-Tx-1: if, the end dialog period; Otherwise, make V=J=C=Vi=Ji=Ki=Kj=Ti=0 in the vehicle variables.Return the A point.
(P2) otherwise, make Gi=Vi=Ki=0 in the own variable.All vehicles make Ki=Gi=Vi=0 in the variable of Si=0.Judge that whether G is greater than 10: if, the end dialog period; Otherwise, for adding 1, the N counter judges that more whether N is greater than 2: if, the end dialog period; Otherwise, judge that Ti is whether greater than T1-Tx-1: if, the end dialog period; Otherwise, make V=J=C=Vi=Ji=Ki=Kj=Ti=0 in the vehicle variables.Return the A point.
(P1) otherwise, judge that then whether (P3) J is greater than 1: if not, judge again after the D counter adds 1 that whether D is greater than 2: if conclude then and have only a car that this car is decided to be information transmission person, the end dialog period; Otherwise, return the A point.
(P3) otherwise, judge that whether (P4) V is greater than 1: if the vehicle that is numbered V1 sends information M2, V1 and other according to M2 information to Vi greater than 0, make Si=1 in its variable.Accomplish the vehicle of the action of posting a letter at last and judge that according to M2 information (P5) self posts a letter success not: if success makes Gi=G=G+1 in the own variable, Vi=V=V+1, Kj=Ki, Si=1.All vehicles make Ki=Gi=Vi=0 in the variable of Si=0.Judge that whether G is greater than 10: if, the end dialog period; Otherwise, for adding 1, the N counter judges that more whether N is greater than 2: if, the end dialog period; Otherwise, judge that Ti is whether greater than T1-Tx-1: if, the end dialog period; Otherwise, make V=J=C=Vi=Ji=Ki=Kj=Ti=0 in the vehicle variables.Return the A point.
(P5) otherwise, make Gi=Vi=Ki+0 in the own variable.All vehicles make Ki=Gi=Vi=0 in the variable of Si=0.Judge that whether G is greater than 10: if, the end dialog period; Otherwise, for adding 1, the N counter judges that more whether N is greater than 2: if, the end dialog period; Otherwise, judge that Ti is whether greater than T1-Tx-1: if, the end dialog period; Otherwise, make V=J=C=Vi=Ji=Ki=Kj=Ti=0 in the vehicle variables.Return the A point.
(P4) otherwise, make G=0 in all vehicle variables.All vehicles make Ki=Gi=Vi=0 in the variable of Si=0.Judge that whether G is greater than 10: if, the end dialog period; Otherwise, for adding 1, the N counter judges that more whether N is greater than 2: if, the end dialog period; Otherwise, judge that Ti is whether greater than T1-Tx-1: if, the end dialog period; Otherwise, make V=J=C=Vi=Ji=Ki=Kj=Ti=0 in the vehicle variables.Return the A point.
Vehicle is in dialog procedure, because the Kj that obtains of vehicle, the data difference of C make vehicle operating asynchronous, falls behind vehicle and when listening to system's operation, finishes at once to wait for that the action that puts rules into practice joins the normal dialog process.Next dialog procedure start time starting point is the multiple of T1 periods 5 microsecond.
Repeatedly all obtain the information of other vehicles in the dialog procedure back zone in the dialog database of vehicle, and all vehicle dialog database internal informations are identical in the local area.The top speed value that vehicle in the district generates is confirmed as the local area value; The value in local area value and last a period of time time is compared; If numerical value equates that the duration that then will go up for the moment inferior speed adds 5 seconds duration values as this time time speed, otherwise the duration value of its speed is decided to be 5 seconds.Local area speed is 0 o'clock, if local area speed was got the rear value to rear adjacent region speed greater than 1 minute (km/hour) and duration more than or equal to 10, its duration is decided to be 1 second.With information weight (Qi) the maximum as local area information transmission person, if the informative weight heavy phase with, then get apart from the nearest person of this district center, if distance equates, then get the success numbering reckling of posting a letter.
Set up vehicle T2 period information transmission control variable Td, Ty, Th, Tw and ND, NY, NH, NW; Write down four (top, one-level, outside and limited area) database information transmission cumulative times and four data library information surpluses (not repeat count, the data surplus is that 0 expression information has passed) respectively.
T2 period operation rule (referring to Fig. 6):
Post a letter vehicle to each database information according to priority not (top, one-level and the limited area database information is preferential with nearest person of rise time, if the time identical, with preferential apart from the nearest person of local area; The external data base message priority for promptly dodge, urban road seriously blocks up, traffic temporary control and traffic lights information) transmission, receive information simultaneously.Because data are relay transmission, high level information is late arriving to, and again the priority level of data library information is lined up after one group of information of every transmission.At first transmit top database information (maximum duration be T2 period 1/4th); Next transmits one-level database information (maximum duration be T2 period 1/4th); Then transmit outer database information (maximum duration be T2 period 1/9th) transmits the limited area database information at last.Because data are relay transmission; The upper level database information is late arriving to; Database can be brought in constant renewal in, and after next stage database information transmission is accomplished, changes over to and detects top database information, if the transmission time that top database distributes does not use up and new data have been arranged; The top database information of prioritised transmission then detects time one-level database information and with above-mentioned rule operation otherwise change over to.The limited area database information changes the top database information of detection over to and moves with above-mentioned rule after 30 groups of data of transmission.Each database information transmits used T.T. segmentation accumulative total.
Limited area R value regulation rule: greater than 0.1, then R increases a step-length unit as if ((T2-Td-Ty-Th-Tw)/(Td+Ty+Th+Tw)); If ((T2-Td-Ty-Th-Tw)/(Td+Ty+Th+Tw)) less than 0.001, then R reduces by a step-length unit; Otherwise the R value does not adjust.
T3 period operation task: receive the interior traffic lights of limited area (R), traffic temporary control, promptly dodge information.Receive the serious congestion information of urban road.Adjustment R value.
Description of drawings
Fig. 1 is overall framework figure of the present invention.
Fig. 2 is the road and the communication mode planning system synoptic diagram of simple path among the present invention.
Fig. 3 is the road and the communication mode planning system synoptic diagram of complicated road among the present invention.
Fig. 4 is a limited area scope synoptic diagram among the present invention.
Fig. 5 is T1 among the present invention (dialogue) period operational scheme synoptic diagram.
Fig. 6 is T2 among the present invention (transmission) period operational scheme synoptic diagram.
Fig. 7 is that vehicle is in time evaded the highway section operation synoptic diagram that blocks up among the present invention.
Embodiment
With the road subregion on the satellite navigation map, realize that the radio communication frequency does not have conflict and uses and generate planning database with road and communication mode planning system, set up historical data base, real-time data base and vehicle dialog database.With the satellite navigation system time (Beijing time) be standard, be a cycle period per 5 seconds, the mutual transmission primaries Real-time Traffic Information of vehicle, cycle period are divided into T1 (1.5 seconds), T2 (3 seconds), 3 periods of T3 (0.5 second).
The T1 period: the first step makes K=30 in the message exchange control variable, N=D=G=V=J=C=Kj=Gi=Si=Ti=Tx=0.Second step was that the basis generates the vehicle Real-time Traffic Information with the satellite navigation system.In the 3rd step, vehicle is included into a certain district according to the layout data library information with this car, and confirms the communication frequency of self.In the 4th step, each is distinguished vehicle and uses local area communication frequency to talk with mutually, with exchange message, processed local area Real-time Traffic Information and definite information transmission person (referring to Fig. 5).
The T2 period: in the 5th step, make Td=Ty=Th=Tw=ND=NY=NH=NW=0 in the information transmission control variable.In the 6th step, when distinguishing information transmission person and send Real-time Traffic Information, each receives the Real-time Traffic Information that out of Memory transmission person sends, the Real-time Traffic Information (referring to Fig. 6) that other vehicle reception as much as possible information transmission person sends.
The T3 period: in the 7th step, vehicle receives external information.In the 8th step, vehicle is adjusted the R value according to T2 period information transmission required time data: greater than 0.1, then R increases a step-length unit as if ((T2-Td-Ty-Th-Tw)/(Td+Ty+Th+Tw)); If ((T2-Td-Ty-Th-Tw)/(Td+Ty+Th+Tw)) reduces by a step-length unit less than 0.001 R; Otherwise the R value does not adjust.In the 9th step, change the T1 period task of carrying out over to.
Through above step, vehicle all can obtain the place ahead limited area Real-time Traffic Information within 5 seconds.Real-time Traffic Information is responsible for showing and is used to satellite navigation system, and driver and satellite navigation system can in time be evaded according to Real-time Traffic Information and being blocked up and the low speed highway section.For example, being in the vehicle that urban road C orders will arrive B point (referring to Fig. 7) through A point, if the A point gets congestion, vehicle constantly gets into the A-C highway section, and C point horse back can get congestion, and C1, C2 point is got congestion, thereby cause the large tracts of land traffic congestion.The invention provides the Real-time Traffic Information of vehicle front limited area, be in the vehicle that C orders and find that the A point gets congestion, and can select two other route (C-C1-A1-B1-B; C-C2-A2-B2-B) arrive the B point, thereby avoided blocking up, improved the traffic capacity of urban road.
Claims (9)
1. the collection and the transmission method of a vehicle front limited area Real-time Traffic Information; It is characterized in that: be the basis with vehicle-mounted satellite navigation system; Adopt the wireless broadcast communication mode to carry out information transmission; Road is divided into the district and for its allocate communications resource, and vehicle is gathered the local area Real-time Traffic Information, intercourses information, is confirmed information transmission person and Real-time Traffic Information in the limited area of the place ahead is transmitted by the relay rearward of weight size in the district; The present invention includes wireless communication system, road and communication mode planning system, Real-time Traffic Information acquisition processing system, Database Systems and Real-time Traffic Information transmission system.
2. method according to claim 1; It is characterized in that: said wireless communication system uses 802.11 standards as the wireless communication system basis; With radio broadcasting mode using system hardware,, obtain 16 virtual frequencies with the Time Division Multiplexing method with 2412MHz, 2432MHz, 2452MHz, four frequencies of 2472MHz in the public radio band of 2.4G; With the concurrent carry information of full detail of all logic frequencies of 802.11 chips reception, this chip is used for access of radio network.
3. method according to claim 1; It is characterized in that: said road and communication mode planning system are foundation with vehicle-mounted satellite navigation map; Has been to press east, south, west, 4 working direction in north with road with node (intersection central point); Each direction is cut apart with 4 districts (each district's fundamental length is 100 meters) circulation, and symbiosis becomes 16 different districts and is its allocate communications frequency, gives equidirectional district with the frequency point allocation of identical period; The length in adjustment district is divided into not district's number for (4N+1) to exempt Communication Jamming with the highway section between two nodes; Is that principle is carried out subregion and distributed frequency with complicated highway section with the proper communication of assurance major trunk roads; Road subregion and frequency point allocation information are generated road and wireless frequency planning database (hereinafter is referred to as planning database).
4. method according to claim 1; It is characterized in that: said Real-time Traffic Information acquisition processing system obtains a velocity amplitude from the satellite navigation system per second; 5 speed additions are removed the speed of 5 mean values that obtain as the vehicle location; The velocity information of vehicle location is reduced to 0,1,2,5,10,15,20,30,50,75 and 90 (km/hour) above 11 grades; Its effect is the stability that strengthens its value, and the duration information and the minimizing of speed class that has the vehicle location of actual use value with generation needs information transmitted amount (hereinafter is with the speed class of speed representation vehicle location).
5. method according to claim 1 is characterized in that: said Database Systems comprise planning database, historical data base, information of vehicles switching database and real-time data base; Real-time data base comprises limited regional database (vehicle front, about comprise the up-to-date transport information of road in each R (the R initial value is that 2 minimum value are 1) km radius); Top database (in vehicle front (R+2) the km radius speed be 0 and the duration greater than 5 minutes Real-time Traffic Information); The one-level database (in vehicle front (R+1) the km radius speed be 1 and the duration greater than 2 minutes Real-time Traffic Information); External information database (traffic lights in the vehicle front R km radius, traffic temporary control, promptly dodge information, the serious congestion information of urban road); Every group of information is made up of position, speed, duration 3 data in the limited area database; Every group of information is made up of position, duration 2 data in top database and the one-level database; The big I of limited area is adjusted automatically, and its rule is: if time information transmission period is more than needed, excess time, then the R value increased a step-length unit greater than 10 of time used; Excess time, then the R value reduced by a step-length unit less than the per mille of time used; R value step-length unit is 100 meters.
6. method according to claim 1 is characterized in that: said Real-time Traffic Information transmission system is divided into T1 (1.5 seconds), T2 (3 seconds), 3 periods of T3 (0.5 second), under the planning database support with the circular flow of wireless broadcast communication mode; The task of T1 period is that vehicle is talked with mutually in the district, with exchange message, confirm local area speed and information transmission person; The task of T2 period is respectively to distinguish information transmission person with top database, one-level database, external data base and limited area database information outwards transmission successively, and all vehicles receive the information that other vehicle sends; The task of T3 period is that all vehicles receive external information, according to the adjustment of the rule in T2 period service data and the claim 5 limited area size.
7. method according to claim 6; It is characterized in that: the said T1 period; Successfully do not send the information vehicle in each dialog procedure Zhong Ge district and generate 1 to 30 numbering at random; To number size is the transmitting time foundation; Between 0 to 8 microsecond, send separately random number, speed, position, information weight coefficient (information weight coefficient value equals top database and the one-level database data is counted sum), this dialog procedure originator success or not information at random; Each vehicle receives information that other vehicle sends also to be judged self to post a letter and whether whether successfully reaches the information confirming self to receive by other vehicle approval, does not successfully send the information vehicle and regenerates 1 to 30 random number and carry out next dialog procedure, and repeatedly vehicle all obtains other information of vehicles and makes the information of all vehicles admit mutually in the dialog procedure back zone; With the top speed of vehicle as local area speed, the duration of confirming local area speed according to for the moment time speed and duration thereof on the local area; Local area speed is 0 o'clock, if local area speed was got the rear value greater than 1 minute (km/hour) and duration greater than 10 for the speed of rear adjacent region, its duration is decided to be 1 second; (then get apart from the nearest person of this district center as if the informative weight heavy phase together, as local area information transmission person with information weight coefficient the maximum; If distance equates, then get the success numbering reckling of posting a letter).
8. method according to claim 6 is characterized in that: said each database information of T2 period according to priority not (top, one-level and the limited area database information is preferential with nearest person of rise time, if the time identical, with preferential apart from the nearest person of local area; The external data base message priority for promptly dodge, urban road seriously blocks up, traffic temporary control and traffic lights information) transmission; Information transmission person receives information when sending information; Because level information is late arriving to, again the information priority rank is lined up after whenever sending one group of information; At first transmit top database information (service time be T2 period 1/4th); Next transmits one-level database information (service time be T2 period 1/4th); Transmit outer database information (service time be T2 period 1/9th) transmits the limited area database information at last once more; Because the upper level database information is late arriving to; Change over to after the transmission of next stage database information is accomplished and detect top database information; If the transmission time that top database distributes does not use up and new data has been arranged; The top database information of prioritised transmission then detects time one-level database information and with above-mentioned rule operation otherwise change over to; The limited area database information changes the top database information of detection over to and moves with above-mentioned rule after 30 groups of data of transmission.
9. method according to claim 6; It is characterized in that: all vehicles of said T3 period receive limited area traffic lights, traffic temporary control, promptly dodge information; The serious congestion information of urban road realizes that vehicle supervision department is to native system management of vehicles, scheduling and command function.
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| CN2012103233521A CN102842241A (en) | 2012-09-04 | 2012-09-04 | Collection and transition method of real-time traffic information of limited region in front of car |
| PCT/CN2013/072400 WO2014036819A1 (en) | 2012-09-04 | 2013-03-11 | Collection and transmission method of real-time traffic information of limited region in front of automobile |
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